Penis size problema girlfriend

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Hi, I’m asking for advice about something that happened with a girl. I practically suffer from erectile dysfunction and lose a few centimeters of circumference, length, and turgor because of this problem. Anyway, I am having intimacy with a girl, and my penis gives me trouble, but let's say I manage to use it.

​What happened was that while she was on top, I put it in—knowing that I always lose a bit of firmness in that position. When I inserted it, she asked me if it was already in, which completely crushed me inside. Now, when I masturbate her with my fingers, she cumes and has a great time. How is it possible not to feel a penis, but to feel two fingers?

​Another thing: at that exact moment, I pulled my penis out, and since I had a tailoring tape measure nearby, I measured it. It was 14.5 cm at its thickest point. Let's factor in that in that position I probably lost half a centimeter, which happens to me often, but that's still 14 cm of circumference! Compared to two fingers, that is much bigger. I admit that I don't have the hardness I have when I reach 16 cm of circumference, and unfortunately, with the dysfunction, it's hard for me right now. Still, I can't wrap my head around how this is possible, and I'm stressing myself out, worrying that I have a small penis. Can anyone give me answers? Has this ever happened to you?